NAME¶
doveadm-pw - Dovecot's password hash generator
SYNOPSIS¶
doveadm [
-Dv]
pw -l
doveadm [
-Dv]
pw [
-p password] [
-r
rounds] [
-s scheme] [
-u user] [
-V]
doveadm [
-Dv]
pw -t hash [
-u user]
DESCRIPTION¶
doveadm pw is used to generate password hashes for different password
schemes and optionally verify the generated hash.
All generated password hashes have a {
scheme} prefix, for example
{
SHA512-CRYPT.HEX}. All passdbs have a default scheme for passwords
stored without the {
scheme} prefix. The default scheme can be
overridden by storing the password with the scheme prefix.
OPTIONS¶
Global
doveadm(1) options:
- -D
- Enables verbosity and debug messages.
- -v
- Enables verbosity, including progress counter.
Command specific
options:
- -l
- List all supported password schemes and exit
successfully.
There are up to three optional password schemes: BLF-CRYPT
(Blowfish crypt), SHA256-CRYPT and SHA512-CRYPT. Their
availability depends on the system's currently used libc.
- -p password
- The plain text password for which the hash should be
generated. If no password was given doveadm(1) will prompt
interactively for one.
- -r rounds
- The password schemes BLF-CRYPT,
SHA256-CRYPT and SHA512-CRYPT supports a variable
number of encryption rounds. The following table shows the
minimum/maximum number of encryption rounds per scheme. When the
-r option was omitted the default number of encryption rounds will
be applied.
Scheme | Minimum | Maximum | Default
----------------------------------------------
BLF-CRYPT | 4 | 31 | 5
SHA256-CRYPT | 1000 | 999999999 | 5000
SHA512-CRYPT | 1000 | 999999999 | 5000
- -s scheme
- The password scheme which should be used to generate
the hashed password. By default the CRAM-MD5 scheme
will be used. It is also possible to append an encoding suffix to the
scheme. Supported encoding suffixes are: .b64,
.base64 and .hex.
See also http://wiki2.dovecot.org/Authentication/PasswordSchemes for more
details about password schemes.
- -t hash
- Test if the given password hash matches a given
plain text password.
- -u user
- When the DIGEST-MD5 scheme is used, also
the user name must be given, because the user name is a part of the
generated hash. For more information about Digest-MD5 please read also:
http://wiki2.dovecot.org/Authentication/Mechanisms/DigestMD5
- -V
- When this option is given, the hashed password will be
internally verified. The result of the verification will be shown after
the hashed password, enclosed in parenthesis.
EXAMPLE¶
The first password hash is a DIGEST-MD5 hash for jane.roe@example.com. The
second password hash is a CRAM-MD5 hash for john.doe@example.com.
doveadm pw -s digest-md5 -u jane.roe@example.com
Enter new password:
Retype new password:
{DIGEST-MD5}9b9dcb4466233a9307bbc33708dffda0
doveadm pw
Enter new password:
Retype new password:
{CRAM-MD5}913331d8782236a8ecba7764a63aa27b26437fd40ca878d887f11d81245c2c6b
REPORTING BUGS¶
Report bugs, including
doveconf -n output, to the Dovecot Mailing List
<dovecot@dovecot.org>. Information about reporting bugs is available at:
http://dovecot.org/bugreport.html
SEE ALSO¶
doveadm(1)
